EP0310352A2 - Method for processing of liquid crystal polymers - Google Patents
Method for processing of liquid crystal polymers Download PDFInfo
- Publication number
- EP0310352A2 EP0310352A2 EP88308981A EP88308981A EP0310352A2 EP 0310352 A2 EP0310352 A2 EP 0310352A2 EP 88308981 A EP88308981 A EP 88308981A EP 88308981 A EP88308981 A EP 88308981A EP 0310352 A2 EP0310352 A2 EP 0310352A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid crystal
- orientation
- foils
- lamination
- polymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 229920000106 Liquid crystal polymer Polymers 0.000 title claims abstract description 11
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 15
- 229920000642 polymer Polymers 0.000 claims abstract description 11
- 239000011888 foil Substances 0.000 claims abstract description 9
- 238000003475 lamination Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000007767 bonding agent Substances 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 238000010094 polymer processing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/06—Fibrous reinforcements only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0079—Liquid crystals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/04—Time
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/12—Pressure
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31725—Of polyamide
Definitions
- This invention relates to a method for the processing of liquid crystal polymers which preserves the orientation and hence the associated mechanical properties of the polymers and can find application in the polymer processing industry.
- Liquid crystal melts are orientated during injection-moulding and the resulting molecular orientation in the molten state is frozen after cooling. This orientation reinforces the material, increasing the modulus of elasticity. (See Ultra-High Modulus Polymers, A. Ciferri and I.M. Ward, Eds., Appl. Sci, Publ., London, 1979).
- the molecular orientation of liquid crystal polymers depends strongly on the thickness of the article, the thinner the article, the higher the degree of orientation of the polymer molecules. This high degree of orientation provides for good mechanical properties such as high modulus of elasticity and tensile strength. However, the modulus of elasticity drops abruptly with the rise in thickness of the article. Thus a two-fold increase in thickness leads to a multiple decrease in the modulus of elasticity since the two parameters have an exponential dependence. (See W.J. Jackson, Jr., and H.F. Kuhfuss, J. Polym. Sci., Polym. Chem. Ed., 14 , 2043 (1986)). Briefly, the rise in thickness of the liquid crystal article leads to a loss of the unique mechanical properties of liquid crystal polymers.
- An object of the invention is to provide a method for the processing of liquid crystal polymers by which method, the mechanical properties of the polymer are preserved regardless of the thickness of the processed article.
- liquid crystal polymer bodies wherein liquid crystal polymer foils with a high degree of orientation are subjected to parallel or cross-ply lamination by heating in a vacuum or in an inert medium to an elevated temperature below the melting point of the polymer.
- the method of this invention is applicable to polymers capable of undergoing exchange trans-reactions in the solid state, i.e. chemical repairs to breaks in the polymer chain since the occurance of physical repair (based on diffusion) is unlikely for such rigid liquid crystal molecules due to their low mobility.
- an article of the desired thickness can be obtained, preserving a high degree of orientation in the entire volume and hence excellent mechanical properties.
- Bonding can be realized also by the application of suitable adhesives or other bonding chemicals.
- the method of the invention preserves the high mechanical parameters of the thin foils with the high orientation of the liquid crystal molecules.
- the energy consumption of this method is relatively low since heating is carried out below the melting point of the polymer in the case of lamination. In the case where adhesive compositions are applied, the consumption does not differ from presently used methods.
- the method can be carried out on the existing equipment for lamination and its duration meets the requirements for industrial applications, The following example illustrates this invention.
- a foil 200 microns thick, is prepared from a liquid crystal copolymer of polyethyleneterephthalate with 60 mole-%-p-hydroxybenzoic acid (Eastman Kodak Co., USA) by extrusion through a flat extension nozzle and immediate cooling down to 0°C (ice-water) in order to obtain a frozen liquid crystal structure.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Polyesters Or Polycarbonates (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Liquid crystal polymer foils with a high degree of orientation are subjected to parallel or cross-ply lamination by heating in a vacuum or in an inert medium to an elevated temperature below the melting point of the polymer to produce a thicker liquid crystal polymer article preserving the orientation and associated mechanical properties of the foils.
Description
- This invention relates to a method for the processing of liquid crystal polymers which preserves the orientation and hence the associated mechanical properties of the polymers and can find application in the polymer processing industry.
- It is known that some polymers containing long and rigid molecules can form a liquid crystal phase. Liquid crystal melts are orientated during injection-moulding and the resulting molecular orientation in the molten state is frozen after cooling. This orientation reinforces the material, increasing the modulus of elasticity. (See Ultra-High Modulus Polymers, A. Ciferri and I.M. Ward, Eds., Appl. Sci, Publ., London, 1979).
- The molecular orientation of liquid crystal polymers depends strongly on the thickness of the article, the thinner the article, the higher the degree of orientation of the polymer molecules. This high degree of orientation provides for good mechanical properties such as high modulus of elasticity and tensile strength. However, the modulus of elasticity drops abruptly with the rise in thickness of the article. Thus a two-fold increase in thickness leads to a multiple decrease in the modulus of elasticity since the two parameters have an exponential dependence. (See W.J. Jackson, Jr., and H.F. Kuhfuss, J. Polym. Sci., Polym. Chem. Ed., 14, 2043 (1986)). Briefly, the rise in thickness of the liquid crystal article leads to a loss of the unique mechanical properties of liquid crystal polymers.
- An object of the invention is to provide a method for the processing of liquid crystal polymers by which method, the mechanical properties of the polymer are preserved regardless of the thickness of the processed article.
- According to the present invention there is provided a method for the production of liquid crystal polymer bodies wherein liquid crystal polymer foils with a high degree of orientation are subjected to parallel or cross-ply lamination by heating in a vacuum or in an inert medium to an elevated temperature below the melting point of the polymer.
- The method of this invention is applicable to polymers capable of undergoing exchange trans-reactions in the solid state, i.e. chemical repairs to breaks in the polymer chain since the occurance of physical repair (based on diffusion) is unlikely for such rigid liquid crystal molecules due to their low mobility. As a result of this treatment of the foils, an article of the desired thickness can be obtained, preserving a high degree of orientation in the entire volume and hence excellent mechanical properties.
- Bonding can be realized also by the application of suitable adhesives or other bonding chemicals.
- The method of the invention preserves the high mechanical parameters of the thin foils with the high orientation of the liquid crystal molecules. The energy consumption of this method is relatively low since heating is carried out below the melting point of the polymer in the case of lamination. In the case where adhesive compositions are applied, the consumption does not differ from presently used methods. The method can be carried out on the existing equipment for lamination and its duration meets the requirements for industrial applications,
The following example illustrates this invention. - A foil, 200 microns thick, is prepared from a liquid crystal copolymer of polyethyleneterephthalate with 60 mole-%-p-hydroxybenzoic acid (Eastman Kodak Co., USA) by extrusion through a flat extension nozzle and immediate cooling down to 0°C (ice-water) in order to obtain a frozen liquid crystal structure. A laminate, 1 mm thick, is prepared from these foils by heating to 170-190°C under pressure of about 3 Mpa under a vacuum, with a preliminary "rinsing" with nitrogen being carried out so that no air is present in the residual atmosphere. Lamination is conducted for 10 hours. The laminate thus obtained had a high tensile modulus of 68,000 kg/cm².
Claims (5)
1. A method for the production of liquid crystal polymer bodies wherein liquid crystal polymer foils with a high degree of orientation are subjected to parallel or cross-ply lamination by heating in a vacuum or in an inert medium to an elevated temperature below the melting point of the polymer.
2. A method as claimed in Claim 1 wherein the liquid crystal foils are from 15 to 200 microns thick.
3. A method as claimed in any preceding claim, wherein lamination takes place under a pressure of 0.05 to 5 Mpa.
4. A method as claimed in Claim 3, wherein lamination takes from 3 to 10 hours.
5. A method as claimed in Claim 1 or 2, wherein the lamination is assisted by use of a chemical bonding agent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BG81313/87 | 1987-09-29 | ||
| BG81313A BG50083A1 (en) | 1987-09-29 | 1987-09-29 | Method for preparing of liquid- crystalline polymer lamillats |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0310352A2 true EP0310352A2 (en) | 1989-04-05 |
| EP0310352A3 EP0310352A3 (en) | 1989-07-19 |
Family
ID=3919597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88308981A Withdrawn EP0310352A3 (en) | 1987-09-29 | 1988-09-28 | Method for processing of liquid crystal polymers |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4902369A (en) |
| EP (1) | EP0310352A3 (en) |
| BG (1) | BG50083A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0568083A1 (en) * | 1992-04-30 | 1993-11-03 | Mazda Motor Corporation | Method for molding a liquid crystal resin sheet and molding apparatus thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0328822A (en) * | 1989-06-27 | 1991-02-07 | Nippon Oil Co Ltd | Compensating plate for liquid crystal display element |
| DE4013574A1 (en) * | 1990-04-27 | 1991-10-31 | Hoechst Ag | AREA SHAPED BODY AND METHOD FOR THE PRODUCTION THEREOF |
| US5238638A (en) * | 1990-08-16 | 1993-08-24 | The University Of Akron | Process for preparing a self-reinforced thermoplastic composite laminate |
| US5268225A (en) * | 1990-08-16 | 1993-12-07 | The University Of Akron | Self reinforced thermoplastic composite laminate |
| US5260380A (en) * | 1992-01-23 | 1993-11-09 | The University Of Akron | Self-reinforced composite and process for preparing same |
| US6544382B2 (en) | 1999-11-15 | 2003-04-08 | Pactiv Corporation | Apparatus for high-speed heating and cooling of a polymer |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4388139A (en) * | 1980-07-14 | 1983-06-14 | Fuller David L | Thermosensing article and method of manufacture |
| US4332759A (en) * | 1980-07-15 | 1982-06-01 | Celanese Corporation | Process for extruding liquid crystal polymer |
| US4384016A (en) * | 1981-08-06 | 1983-05-17 | Celanese Corporation | Mutiaxially oriented high performance laminates comprised of uniaxially oriented sheets of thermotropic liquid crystal polymers |
| DE3329341A1 (en) * | 1983-08-13 | 1985-02-28 | Basf Ag, 6700 Ludwigshafen | METHOD FOR PRODUCING FLAT SEMI-FINISHED PRODUCTS |
| DE3516425A1 (en) * | 1985-05-08 | 1986-11-13 | Bayer Ag, 5090 Leverkusen | METHOD FOR PRODUCING MOLDED BODIES AND FILMS FROM THERMOTROPICAL POLYMERS, AND MOLDED BODIES AND FILMS PRODUCED THEREFORE |
| JPS6255130A (en) * | 1985-09-05 | 1987-03-10 | 三井東圧化学株式会社 | Laminated molded shape |
| JPS6295213A (en) * | 1985-10-23 | 1987-05-01 | Asahi Chem Ind Co Ltd | Laminated film and manufacture thereof |
-
1987
- 1987-09-29 BG BG81313A patent/BG50083A1/en unknown
-
1988
- 1988-06-23 US US07/210,260 patent/US4902369A/en not_active Expired - Fee Related
- 1988-09-28 EP EP88308981A patent/EP0310352A3/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0568083A1 (en) * | 1992-04-30 | 1993-11-03 | Mazda Motor Corporation | Method for molding a liquid crystal resin sheet and molding apparatus thereof |
| US5395470A (en) * | 1992-04-30 | 1995-03-07 | Mazda Motor Corporation | Method for molding a liquid crystal resin sheet and molding apparatus thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0310352A3 (en) | 1989-07-19 |
| BG50083A1 (en) | 1992-05-15 |
| US4902369A (en) | 1990-02-20 |
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| 18D | Application deemed to be withdrawn |
Effective date: 19900120 |